I just got back from spending the weekend in Yosemite and I can tell you it was beautiful. Surprisingly, the storm that came through a couple of weeks ago deposited enough snow and subsequent runoff that Yosemite falls is now flowing (usually it is dried up this time of year). I can also tell you that at night it was cold (29degF). Keep watching the online reservations and you just may luck out and find a campsite. The campgrounds were not completely full, but the catch is that most will not accommodate a 25ft trailer. Good luck and enjoy the beauty of Yosemite in the late Autumn! Just to let you know, Tioga Pass and the road to Glacier Point are both now closed for the winter